Slide gate valve



(No Model.) i 2 sheet ssh'et 1.

. W. ROSS.

SLIDE GATE VALVE. N0; 539,922. Patented May 28, 1895.

(No Model.) 2 Sheets-Sheet 2f W. ROSS. SLIDE GATE VALVE.

No. 539,922. Patented May 28, 1895.

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.ATENT WILLIAM ROSS, OF TROY, NEW YORK, ASSIGNOR TO THE TROY VALVECOMPANY, OF SAME PLACE.

SLIDE GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 539,922, dated May 28,1895.

' Application filed September 15,1892. Serial No. 445,945. (in model.)

To all whom it may concern:

Be it known that I, WILLIAM ROSS, a citizen of the United States,residing at Troy, county of Rensselaer, and State of New York, haveinvented certain new and useful Improvements in Slide Gate-Valves, ofwhich the following is a specification.

My invention relates to such improvements and consists of the novelconstruction and combination of parts hereinafter described andsubsequently claimed.

Reference may be had to the accompanying drawings and the letters ofreference marked thereon, which form a part of this specification.

Similar letters refer to similar parts in the several figures.

Figure 1 of the drawings is a view of my improved valve, partlyinelevation and partly in section. Fig. 2 two pairs of interlockingbearing-blocks detached. Fig. 3 is a horizontal section of same, takenon the broken line 3 3 in Fig. 2. Fig. 4 is a view in elevation of oneof the interlocking pairs detached. Fig. 5 is a top -plan view of themobile block detached. Fig. 6 is a view partly in elevation and partlyin section, showing a modified form of bearingblocks.

My invention which forms the subject of this application, is animprovement upon the valve shown and described in United States LettersPatent No. 442,458, dated December 9,1890, to which patent reference maybe had. When the valve is made as shown in said patent, with the mobileblock interposed between the four bearing-blocks, and a wedge-shapedabutment fixed upon the carrier to engage and actuate one pair of theblocks, if one of the gates is kept from its seat by an interposed stoneor other obstruction, the gate-carrier would be forced over toward theopposite side of the valve case to seat the other gate,

thereby causing a lateral movement of the carrier which might'bend thecarrier-stem or cause so much binding friction between it and the caseas to render it difficult to turn the stem sufficiently to fully seatthe gate; and, when one pair of blocks is engaged by a plane-facedabutment, an obstruction which caused one gate to tip more than theother is aview in elevation of would in practice cause an unequal strainupon the carrier, the blocks bearing more heavily upon one side of thecarrier than upon the other side, thereby tending to producea bindingfriction between it and the main stem. By interposing the mobile blockbetween a single pair of the four bearing-blocks and a runway for themobile block on the carrier, the nest of blocks can be moved laterallyof the carrier, and the position of the blocks relatively to the carrierand to each other can be varied to seat one of the gates independentlyof the position of the other gate, and without imparting any lateralmovement or strain to the carrier.

Referring to the drawings, A is the valve-case of the usual formprovided with the straight water-way, A-, and the gateseats, A

A is the carrier which A and A and the nest of blocks.

carries the gates, The

carrier is provided with a screw threaded nut, A adapted to receive thescrewthreaded portion, A of the stem. The stem is provided with a collarshown by dotted lines, A which collar bears upon the top of the case andthe cap, A to pre vent a longitudinal movement of the stem, and allowrotary movement. The rotary movement is'imparted by the handle, A fixedon the exteriorly projecting end of the stem. Rotary movements of thestem impart vertically reciprocating movements to the carrier to slidethe gates to and from a position in front of their respective seats, ina well known manner, and as described in said Patent No. 442,458.

B and B'' are the bearing blocks which bear upon the back of gate, A toseat it; and B and B?- are the bearing blocks which seat the gate, A Iprefer to connect the bearing-blocks in pairs-and have shown as apreferred form the blocks, B, B connected by a plate, B and the blocks,13*, B connected together by a similar plate, B These plates are eachprovided with an offsetting lug, B adapted to interlock, as shown inFig. 3, and hold the blocks within the block-chamber, A in the carrier.The blocks fit loosely in the chamber and are freelymovable to and fromeach other to adapt their position to the position of the gates. The lugon one plate is adapted-to -move freely in the 'slideway or groove, B

J The lower end which engages the case may be of any desired form andthe upper end is preferably provided with a rounded surface, D' and withprojecting pieces, D and D adapted to engage with the carrier wall, Aand support the upper end of the plunger within the chamber, A the stem,D hanging loosely in the opening in wall, A.

To seat the gates, the carrier-stem is rotated in a direction to forcethe carrier downward until, the seating plunger striking the bottom ofthe valve-case, and the mobile block bearing upon the carrier wall whichforms its runway, the seating blocks are forced outward by the plungerand mobile block sufficiently to force the gates tightly against theirseats. Should some obstacle become interposed between one of the gatesand its seat sufficient to prevent an appreciable outward movement ofthe seating-blocks contiguous to that gate, the free movement of theother blocks toward the other gate is not interfered with, and thepartly open gate affords a resisting medium for its seating-blocks, andthe mobile block rolls along its runway, A and along the stationaryseating-block to follow the movable seating -block and tightly seat theunobstructed gate without any lateral movement or strain upon thecarrier or carrier-stem. The seating-plunger while in use, bears uponthe valve-case without connection with the carrier, and its oscillatorymovement in following up a moving bearing-block does not affect thecarrier or carrier-stem. I am thus able to provide a simple gate-seatingmechanism for slide-gate valves which can be operated.withoutcommunicating to the main stem any lateral or side strain,thereby lessening the wear upon the valve and increasing its efficiencyby diminishing the resistance to the force necessary to its operation.

I do not wish to be limited to any exact form for the mobile block, ormeans for securing it in place upon the carrier. Its movement relativelyto the carrier may be rolling, sliding or oscillatory.

The carrier may have a single or a double chamber for one or two nestsof seating-blocks.

In Fig. 6, Ihave shown the bearing-blocks, 66-, a-, a and a -divested ofany rigid connection between them, one block simply resting uponanother.

When desired, the bearing blocks may be connected diagonally, as forexample, a'- with 09-, as indicated by the dotted lines.

WVhat I claim as new, and desire to secure by Letters Patent, is-

1. In a slide-gate valve, the combination with the carrier and two pairsof bearingblocks interposed between a valve gate and a resisting medium;of a mobile block interposed between two of the bearing-blocks and thecarrier; a runway on the carrier for the mobile block and aseating-plunger interposed between the other two bearing-blocks and thevalve-case, substantially as described.

2. In a slide-gate valve, the combination with the carrier and fourbearing-blocks interlockabl y connected in pairs and interposed betweena valve-gate and a resisting medium;

of a mobile block interposed between two of the bearing-blocks and thecarrier; and a seating-plunger interposed between the other twobearing-blocks and the valve-case, substantially as described.

In testimony whereof I have hereunto set my hand this 6th day ofSeptember, 1892.

IVILLIAM ROSS.

\Vitnesses:

GEO. A. MOSHER, FRANK O. CURTIS.

